Steam boiler



March 1 J. POMFRET. SR

swimm BOILER Filed March 19, 1926 Patented Mar. 29, 1927. I I

UNITED STATES PATENT OFFICE.

JOHN POMFRET, SR, 01 PATERSON, NEW JERSEY.

STEAM BOILER.

Application filed March 19, 1926. Serial N 0. 95,831.

My invention relates to improvements in three in number and having one edge in steam boilers, in which the heating surface common, are equal in size and are pressed is provided at suitable places with tubes into the sides of the tube for the greater part 40 closed on one end and opening into the boiler, of its length but converge to a point (4) in 5 and having three or more chambers therein. the center of the closed end, thus forming in The objects of the invention are to aiiord the tube three chambers Which have separate a greater heating suriace and to improve openings into the boiler and a common sac the circulation of water therein, thereby atthe closed end. 45 economizing in the use of fuel and decreas- I claiming the gathering of sediment in the area of 1. In a steam boiler, a cylindrical tube the firebox. In high pressure boilers, the on the heating surface, closed and convex on invention may be placed between stay bolts one end, the other end being open and havand crown bolts in the firebox, and it may ing a thread cut round its outer edge and 50 also be used in low pressure boilers having screwed into the boiler plate; having therein no stay bolts. a diaphragm comprising three or more i I attain these objects by the mechanism equal planes with one edge in common and illustrated in the accompanying drawing, in converging at the closed end, forming three whichor more chambers in the tube which have 55 Figure 1 is a plan and elevation of the separate openings into the boiler and a comtube, mon sac at the closed end, substantially as Figure 2 is a plan and elevation of the described. diaphragm when separated from the tube, 2. The combination of a steam boiler with Figure 3 is a plan and elevation of the a plurality of cylindrical tubes on the heat- 6!;

tube with the diaphragm inserted therein, ing surface thereof, each tube being closed Figure 4 is a plan view of the tube in conand convex on one end, the other end having nection with a section of firebox, and an orifice opening into the boiler and having Figure 5 is an elevation of the tube in cona thread round its outer edge and screwed nection with a section of firebox. into the boiler plate; each tube having there- Similar numerals refer to similar parts in a diaphragm comprising three or more 30 throughout the several views. planes having one edge in common and con- The cylindrical tube (1) is closed and converging at the closed end, forming in the vex at one end. Round the outer edge of tube three: or more chambers which have the orifice of the tube runs a thread (2), separate openings into the boiler and a comso that the tube may 'be screwed into a mon sac at the closed end, substantially as 36 tapped hole in the boiler plate (5) and welddescribed.

ed. The diaphragm (3) is inserted into the tube (1). The planes of the diaphragm JOHN POMFRET, SR. 

